<?php
/**
 * General template tags that can go anywhere in a template.
 *
 * @package WordPress
 * @subpackage Template
 */

/**
 * Load header template.
 *
 * Includes the header template for a theme or if a name is specified then a
 * specialised header will be included.
 *
 * For the parameter, if the file is called "header-special.php" then specify
 * "special".
 *
 * @uses locate_template()
 * @since 1.5.0
 * @uses do_action() Calls 'get_header' action.
 *
 * @param string $name The name of the specialised header.
 */
function get_header($name = null) {
    do_action('get_header', $name);

    $templates = array();
    if (isset($name))
        $templates[] = "header-{$name}.php";

    $templates[] = "header.php";

    // Backward compat code will be removed in a future release
    if ('' == locate_template($templates, true))
        load_template(ABSPATH . WPINC . '/theme-compat/header.php');
}

/**
 * Load footer template.
 *
 * Includes the footer template for a theme or if a name is specified then a
 * specialised footer will be included.
 *
 * For the parameter, if the file is called "footer-special.php" then specify
 * "special".
 *
 * @uses locate_template()
 * @since 1.5.0
 * @uses do_action() Calls 'get_footer' action.
 *
 * @param string $name The name of the specialised footer.
 */
function get_footer($name = null) {
    do_action('get_footer', $name);

    $templates = array();
    if (isset($name))
        $templates[] = "footer-{$name}.php";

    $templates[] = "footer.php";

    // Backward compat code will be removed in a future release
    if ('' == locate_template($templates, true))
        load_template(ABSPATH . WPINC . '/theme-compat/footer.php');
}

/**
 * Load sidebar template.
 *
 * Includes the sidebar template for a theme or if a name is specified then a
 * specialised sidebar will be included.
 *
 * For the parameter, if the file is called "sidebar-special.php" then specify
 * "special".
 *
 * @uses locate_template()
 * @since 1.5.0
 * @uses do_action() Calls 'get_sidebar' action.
 *
 * @param string $name The name of the specialised sidebar.
 */
function get_sidebar($name = null) {
    do_action('get_sidebar', $name);

    $templates = array();
    if (isset($name))
        $templates[] = "sidebar-{$name}.php";

    $templates[] = "sidebar.php";

    // Backward compat code will be removed in a future release
    if ('' == locate_template($templates, true))
        load_template(ABSPATH . WPINC . '/theme-compat/sidebar.php');
}

/**
 * Load a template part into a template
 *
 * Makes it easy for a theme to reuse sections of code in a easy to overload way
 * for child themes.
 *
 * Includes the named template part for a theme or if a name is specified then a
 * specialised part will be included. If the theme contains no {slug}.php file
 * then no template will be included.
 *
 * The template is included using require, not require_once, so you may include the
 * same template part multiple times.
 *
 * For the parameter, if the file is called "{slug}-special.php" then specify
 * "special".
 *
 * @uses locate_template()
 * @since 3.0.0
 * @uses do_action() Calls 'get_template_part{$slug}' action.
 *
 * @param string $slug The slug name for the generic template.
 * @param string $name The name of the specialised template.
 */
function get_template_part($slug, $name = null) {
    do_action("get_template_part_{$slug}", $slug, $name);

    $templates = array();
    if (isset($name))
        $templates[] = "{$slug}-{$name}.php";

    $templates[] = "{$slug}.php";

    locate_template($templates, true, false);
}

/**
 * Display search form.
 *
 * Will first attempt to locate the searchform.php file in either the child or
 * the parent, then load it. If it doesn't exist, then the default search form
 * will be displayed. The default search form is HTML, which will be displayed.
 * There is a filter applied to the search form HTML in order to edit or replace
 * it. The filter is 'get_search_form'.
 *
 * This function is primarily used by themes which want to hardcode the search
 * form into the sidebar and also by the search widget in WordPress.
 *
 * There is also an action that is called whenever the function is run called,
 * 'get_search_form'. This can be useful for outputting JavaScript that the
 * search relies on or various formatting that applies to the beginning of the
 * search. To give a few examples of what it can be used for.
 *
 * @since 2.7.0
 * @param boolean $echo Default to echo and not return the form.
 */
function get_search_form($echo = true) {
    do_action('get_search_form');

    $search_form_template = locate_template('searchform.php');
    if ('' != $search_form_template) {
        require($search_form_template);
        return;
    }

    $form = '<form role="search" method="get" id="searchform" action="' . home_url('/') . '" >
	<div><label class="screen-reader-text" for="s">' . __('Search for:') . '</label>
	<input type="text" value="' . get_search_query() . '" name="s" id="s" />
	<input type="submit" id="searchsubmit" value="' . esc_attr__('Search') . '" />
	</div>
	</form>';

    if ($echo)
        echo apply_filters('get_search_form', $form);
    else
        return apply_filters('get_search_form', $form);
}

/**
 * Display the Log In/Out link.
 *
 * Displays a link, which allows users to navigate to the Log In page to log in
 * or log out depending on whether they are currently logged in.
 *
 * @since 1.5.0
 * @uses apply_filters() Calls 'loginout' hook on HTML link content.
 *
 * @param string $redirect Optional path to redirect to on login/logout.
 * @param boolean $echo Default to echo and not return the link.
 */
function wp_loginout($redirect = '', $echo = true) {
    if (!is_user_logged_in())
        $link = '<a href="' . esc_url(wp_login_url($redirect)) . '">' . __('Log in') . '</a>';
    else
        $link = '<a href="' . esc_url(wp_logout_url($redirect)) . '">' . __('Log out') . '</a>';

    if ($echo)
        echo apply_filters('loginout', $link);
    else
        return apply_filters('loginout', $link);
}

/**
 * Returns the Log Out URL.
 *
 * Returns the URL that allows the user to log out of the site
 *
 * @since 2.7.0
 * @uses wp_nonce_url() To protect against CSRF
 * @uses site_url() To generate the log in URL
 * @uses apply_filters() calls 'logout_url' hook on final logout url
 *
 * @param string $redirect Path to redirect to on logout.
 */
function wp_logout_url($redirect = '') {
    $args = array('action' => 'logout');
    if (!empty($redirect)) {
        $args['redirect_to'] = urlencode($redirect);
    }

    $logout_url = add_query_arg($args, site_url('wp-login.php', 'login'));
    $logout_url = wp_nonce_url($logout_url, 'log-out');

    return apply_filters('logout_url', $logout_url, $redirect);
}

/**
 * Returns the Log In URL.
 *
 * Returns the URL that allows the user to log in to the site
 *
 * @since 2.7.0
 * @uses site_url() To generate the log in URL
 * @uses apply_filters() calls 'login_url' hook on final login url
 *
 * @param string $redirect Path to redirect to on login.
 * @param bool $force_reauth Whether to force reauthorization, even if a cookie is present. Default is false.
 * @return string A log in url
 */
function wp_login_url($redirect = '', $force_reauth = false) {
    $login_url = site_url('wp-login.php', 'login');

    if (!empty($redirect))
        $login_url = add_query_arg('redirect_to', urlencode($redirect), $login_url);

    if ($force_reauth)
        $login_url = add_query_arg('reauth', '1', $login_url);

    return apply_filters('login_url', $login_url, $redirect);
}

/**
 * Provides a simple login form for use anywhere within WordPress. By default, it echoes
 * the HTML immediately. Pass array('echo'=>false) to return the string instead.
 *
 * @since 3.0.0
 * @param array $args Configuration options to modify the form output
 * @return Void, or string containing the form
 */
function wp_login_form($args = array()) {
    $defaults = array('echo' => true,
        'redirect' => site_url($_SERVER['REQUEST_URI']), // Default redirect is back to the current page
        'form_id' => 'loginform',
        'label_username' => __('Username'),
        'label_password' => __('Password'),
        'label_remember' => __('Remember Me'),
        'label_log_in' => __('Log In'),
        'id_username' => 'user_login',
        'id_password' => 'user_pass',
        'id_remember' => 'rememberme',
        'id_submit' => 'wp-submit',
        'remember' => true,
        'value_username' => '',
        'value_remember' => false, // Set this to true to default the "Remember me" checkbox to checked
    );
    $args = wp_parse_args($args, apply_filters('login_form_defaults', $defaults));

    $form = '
		<form name="' . $args['form_id'] . '" id="' . $args['form_id'] . '" action="' . site_url('wp-login.php', 'login') . '" method="post">
			' . apply_filters('login_form_top', '', $args) . '
			<p class="login-username">
				<label for="' . esc_attr($args['id_username']) . '">' . esc_html($args['label_username']) . '</label>
				<input type="text" name="log" id="' . esc_attr($args['id_username']) . '" class="input" value="' . esc_attr($args['value_username']) . '" size="20" tabindex="10" />
			</p>
			<p class="login-password">
				<label for="' . esc_attr($args['id_password']) . '">' . esc_html($args['label_password']) . '</label>
				<input type="password" name="pwd" id="' . esc_attr($args['id_password']) . '" class="input" value="" size="20" tabindex="20" />
			</p>
			' . apply_filters('login_form_middle', '', $args) . '
			' . ( $args['remember'] ? '<p class="login-remember"><label><input name="rememberme" type="checkbox" id="' . esc_attr($args['id_remember']) . '" value="forever" tabindex="90"' . ( $args['value_remember'] ? ' checked="checked"' : '' ) . ' /> ' . esc_html($args['label_remember']) . '</label></p>' : '' ) . '
			<p class="login-submit">
				<input type="submit" name="wp-submit" id="' . esc_attr($args['id_submit']) . '" class="button-primary" value="' . esc_attr($args['label_log_in']) . '" tabindex="100" />
				<input type="hidden" name="redirect_to" value="' . esc_attr($args['redirect']) . '" />
			</p>
			' . apply_filters('login_form_bottom', '', $args) . '
		</form>';

    if ($args['echo'])
        echo $form;
    else
        return $form;
}

function wp_login_form_has($args = array()) {
    $defaults = array('echo' => true,
    'redirect' => 'index.php',
    'form_id' => 'loginform',
    'label_username' => __('Username'),
    'label_password' => __('Password'),
    'label_remember' => __('Remember Me'),
    'label_log_in' => __('Log In'), 
    'id_username' => 'user_login',
    'id_password' => 'user_pass',
    'id_remember' => 'rememberme',
    'id_submit' => 'wp-submit',
    'remember' => true,
    'value_username' => '',
    'value_remember' => false, // Set this to true to default the "Remember me" checkbox to checked
    );
    $args = wp_parse_args($args, apply_filters('login_form_defaults', $defaults));

    $form = '
		<form name="' . $args['form_id'] . '" id="' . $args['form_id'] . '" action="' . site_url('wp-login.php', 'login') . '" method="post">
			' . apply_filters('login_form_top', '', $args) . '
			<p class="login-username">
				<label for="' . esc_attr($args['id_username']) . '">' . esc_html($args['label_username']) . '</label>
				<input type="text" name="log" id="' . esc_attr($args['id_username']) . '" class="input" value="' . esc_attr($args['value_username']) . '" size="20" tabindex="10" />
			</p>
			<p class="login-password">
				<label for="' . esc_attr($args['id_password']) . '">' . esc_html($args['label_password']) . '</label>
				<input type="password" name="pwd" id="' . esc_attr($args['id_password']) . '" class="input" value="" size="20" tabindex="20" />
			</p>
			' . apply_filters('login_form_middle', '', $args) . '
			' . ( $args['remember'] ? '<p class="login-remember"><label><input name="rememberme" type="checkbox" id="' . esc_attr($args['id_remember']) . '" value="forever" tabindex="90"' . ( $args['value_remember'] ? ' checked="checked"' : '' ) . ' /> ' . esc_html($args['label_remember']) . '</label></p>' : '' ) . '
			<p class="login-submit">
				<input type="submit" name="wp-submit" id="' . esc_attr($args['id_submit']) . '" class="button-primary" value="' . esc_attr($args['label_log_in']) . '" tabindex="100" />
				<input type="hidden" name="redirect_to" value="' . esc_attr($args['redirect']) . '" />
			</p>
			' . apply_filters('login_form_bottom', '', $args) . '
		</form>';

    if ($args['echo'])
        echo $form;
    else
        return $form;
}

/**
 * Returns the Lost Password URL.
 *
 * Returns the URL that allows the user to retrieve the lost password
 *
 * @since 2.8.0
 * @uses site_url() To generate the lost password URL
 * @uses apply_filters() calls 'lostpassword_url' hook on the lostpassword url
 *
 * @param string $redirect Path to redirect to on login.
 */
function wp_lostpassword_url($redirect = '') {
    $args = array('action' => 'lostpassword');
    if (!empty($redirect)) {
        $args['redirect_to'] = $redirect;
    }

    $lostpassword_url = add_query_arg($args, site_url('wp-login.php', 'login'));
    return apply_filters('lostpassword_url', $lostpassword_url, $redirect);
}

/**
 * Display the Registration or Admin link.
 *
 * Display a link which allows the user to navigate to the registration page if
 * not logged in and registration is enabled or to the dashboard if logged in.
 *
 * @since 1.5.0
 * @uses apply_filters() Calls 'register' hook on register / admin link content.
 *
 * @param string $before Text to output before the link (defaults to <li>).
 * @param string $after Text to output after the link (defaults to </li>).
 * @param boolean $echo Default to echo and not return the link.
 */
function wp_register($before = '<li>', $after = '</li>', $echo = true) {

    if (!is_user_logged_in()) {
        if (get_option('users_can_register'))
            $link = $before . '<a href="' . site_url('wp-login.php?action=register', 'login') . '">' . __('Register') . '</a>' . $after;
        else
            $link = '';
    } else {
        $link = $before . '<a href="' . admin_url() . '">' . __('Site Admin') . '</a>' . $after;
    }

    if ($echo)
        echo apply_filters('register', $link);
    else
        return apply_filters('register', $link);
}

/**
 * Theme container function for the 'wp_meta' action.
 *
 * The 'wp_meta' action can have several purposes, depending on how you use it,
 * but one purpose might have been to allow for theme switching.
 *
 * @since 1.5.0
 * @link http://trac.wordpress.org/ticket/1458 Explanation of 'wp_meta' action.
 * @uses do_action() Calls 'wp_meta' hook.
 */
function wp_meta() {
    do_action('wp_meta');
}

/**
 * Display information about the blog.
 *
 * @see get_bloginfo() For possible values for the parameter.
 * @since 0.71
 *
 * @param string $show What to display.
 */
function bloginfo($show='') {
    echo get_bloginfo($show, 'display');
}

/**
 * Retrieve information about the blog.
 *
 * Some show parameter values are deprecated and will be removed in future
 * versions. These options will trigger the _deprecated_argument() function.
 * The deprecated blog info options are listed in the function contents.
 *
 * The possible values for the 'show' parameter are listed below.
 * <ol>
 * <li><strong>url</strong> - Blog URI to homepage.</li>
 * <li><strong>wpurl</strong> - Blog URI path to WordPress.</li>
 * <li><strong>description</strong> - Secondary title</li>
 * </ol>
 *
 * The feed URL options can be retrieved from 'rdf_url' (RSS 0.91),
 * 'rss_url' (RSS 1.0), 'rss2_url' (RSS 2.0), or 'atom_url' (Atom feed). The
 * comment feeds can be retrieved from the 'comments_atom_url' (Atom comment
 * feed) or 'comments_rss2_url' (RSS 2.0 comment feed).
 *
 * @since 0.71
 *
 * @param string $show Blog info to retrieve.
 * @param string $filter How to filter what is retrieved.
 * @return string Mostly string values, might be empty.
 */
function get_bloginfo($show = '', $filter = 'raw') {

    switch ($show) {
        case 'home' : // DEPRECATED
        case 'siteurl' : // DEPRECATED
            _deprecated_argument(__FUNCTION__, '2.2', sprintf(__('The <code>%s</code> option is deprecated for the family of <code>bloginfo()</code> functions.'), $show) . ' ' . sprintf(__('Use the <code>%s</code> option instead.'), 'url'));
        case 'url' :
            $output = home_url();
            break;
        case 'wpurl' :
            $output = site_url();
            break;
        case 'description':
            $output = get_option('blogdescription');
            break;
        case 'rdf_url':
            $output = get_feed_link('rdf');
            break;
        case 'rss_url':
            $output = get_feed_link('rss');
            break;
        case 'rss2_url':
            $output = get_feed_link('rss2');
            break;
        case 'atom_url':
            $output = get_feed_link('atom');
            break;
        case 'comments_atom_url':
            $output = get_feed_link('comments_atom');
            break;
        case 'comments_rss2_url':
            $output = get_feed_link('comments_rss2');
            break;
        case 'pingback_url':
            $output = get_option('siteurl') . '/xmlrpc.php';
            break;
        case 'stylesheet_url':
            $output = get_stylesheet_uri();
            break;
        case 'stylesheet_directory':
            $output = get_stylesheet_directory_uri();
            break;
        case 'template_directory':
        case 'template_url':
            $output = get_template_directory_uri();
            break;
        case 'admin_email':
            $output = get_option('admin_email');
            break;
        case 'charset':
            $output = get_option('blog_charset');
            if ('' == $output)
                $output = 'UTF-8';
            break;
        case 'html_type' :
            $output = get_option('html_type');
            break;
        case 'version':
            global $wp_version;
            $output = $wp_version;
            break;
        case 'language':
            $output = get_locale();
            $output = str_replace('_', '-', $output);
            break;
        case 'text_direction':
            //_deprecated_argument( __FUNCTION__, '2.2', sprintf( __('The <code>%s</code> option is deprecated for the family of <code>bloginfo()</code> functions.' ), $show ) . ' ' . sprintf( __( 'Use the <code>%s</code> function instead.' ), 'is_rtl()'  ) );
            if (function_exists('is_rtl')) {
                $output = is_rtl() ? 'rtl' : 'ltr';
            } else {
                $output = 'ltr';
            }
            break;
        case 'name':
        default:
            $output = get_option('blogname');
            break;
    }

    $url = true;
    if (strpos($show, 'url') === false &&
            strpos($show, 'directory') === false &&
            strpos($show, 'home') === false)
        $url = false;

    if ('display' == $filter) {
        if ($url)
            $output = apply_filters('bloginfo_url', $output, $show);
        else
            $output = apply_filters('bloginfo', $output, $show);
    }

    return $output;
}

/**
 * Retrieve the current blog id
 *
 * @since 3.1.0
 *
 * @return int Blog id
 */
function get_current_blog_id() {
    global $blog_id;
    return absint($blog_id);
}

/**
 * Display or retrieve page title for all areas of blog.
 *
 * By default, the page title will display the separator before the page title,
 * so that the blog title will be before the page title. This is not good for
 * title display, since the blog title shows up on most tabs and not what is
 * important, which is the page that the user is looking at.
 *
 * There are also SEO benefits to having the blog title after or to the 'right'
 * or the page title. However, it is mostly common sense to have the blog title
 * to the right with most browsers supporting tabs. You can achieve this by
 * using the seplocation parameter and setting the value to 'right'. This change
 * was introduced around 2.5.0, in case backwards compatibility of themes is
 * important.
 *
 * @since 1.0.0
 *
 * @param string $sep Optional, default is '&raquo;'. How to separate the various items within the page title.
 * @param bool $display Optional, default is true. Whether to display or retrieve title.
 * @param string $seplocation Optional. Direction to display title, 'right'.
 * @return string|null String on retrieve, null when displaying.
 */
function wp_title($sep = '&raquo;', $display = true, $seplocation = '') {
    global $wpdb, $wp_locale;

    $m = get_query_var('m');
    $year = get_query_var('year');
    $monthnum = get_query_var('monthnum');
    $day = get_query_var('day');
    $search = get_query_var('s');
    $title = '';

    $t_sep = '%WP_TITILE_SEP%'; // Temporary separator, for accurate flipping, if necessary
    // If there is a post
    if (is_single() || ( is_home() && !is_front_page() ) || ( is_page() && !is_front_page() )) {
        $title = single_post_title('', false);
    }

    // If there's a category or tag
    if (is_category() || is_tag()) {
        $title = single_term_title('', false);
    }

    // If there's a taxonomy
    if (is_tax ()) {
        $term = get_queried_object();
        $tax = get_taxonomy($term->taxonomy);
        $title = single_term_title($tax->labels->name . $t_sep, false);
    }

    // If there's an author
    if (is_author ()) {
        $author = get_queried_object();
        $title = $author->display_name;
    }

    // If there's a post type archive
    if (is_post_type_archive ())
        $title = post_type_archive_title('', false);

    // If there's a month
    if (is_archive() && !empty($m)) {
        $my_year = substr($m, 0, 4);
        $my_month = $wp_locale->get_month(substr($m, 4, 2));
        $my_day = intval(substr($m, 6, 2));
        $title = $my_year . ($my_month ? $t_sep . $my_month : "") . ($my_day ? $t_sep . $my_day : "");
    }

    // If there's a year
    if (is_archive() && !empty($year)) {
        $title = $year;
        if (!empty($monthnum))
            $title .= $t_sep . $wp_locale->get_month($monthnum);
        if (!empty($day))
            $title .= $t_sep . zeroise($day, 2);
    }

    // If it's a search
    if (is_search ()) {
        /* translators: 1: separator, 2: search phrase */
        $title = sprintf(__('Search Results %1$s %2$s'), $t_sep, strip_tags($search));
    }

    // If it's a 404 page
    if (is_404 ()) {
        $title = __('Page not found');
    }

    $prefix = '';
    if (!empty($title))
        $prefix = " $sep ";

    // Determines position of the separator and direction of the breadcrumb
    if ('right' == $seplocation) { // sep on right, so reverse the order
        $title_array = explode($t_sep, $title);
        $title_array = array_reverse($title_array);
        $title = implode(" $sep ", $title_array) . $prefix;
    } else {
        $title_array = explode($t_sep, $title);
        $title = $prefix . implode(" $sep ", $title_array);
    }

    $title = apply_filters('wp_title', $title, $sep, $seplocation);

    // Send it out
    if ($display)
        echo $title;
    else
        return $title;
}

/**
 * Display or retrieve page title for post.
 *
 * This is optimized for single.php template file for displaying the post title.
 *
 * It does not support placing the separator after the title, but by leaving the
 * prefix parameter empty, you can set the title separator manually. The prefix
 * does not automatically place a space between the prefix, so if there should
 * be a space, the parameter value will need to have it at the end.
 *
 * @since 0.71
 *
 * @param string $prefix Optional. What to display before the title.
 * @param bool $display Optional, default is true. Whether to display or retrieve title.
 * @return string|null Title when retrieving, null when displaying or failure.
 */
function single_post_title($prefix = '', $display = true) {
    $_post = get_queried_object();

    if (!isset($_post->post_title))
        return;

    $title = apply_filters('single_post_title', $_post->post_title, $_post);
    if ($display)
        echo $prefix . $title;
    else
        return $title;
}

/**
 * Display or retrieve title for a post type archive.
 *
 * This is optimized for archive.php and archive-{$post_type}.php template files
 * for displaying the title of the post type.
 *
 * @since 3.1.0
 *
 * @param string $prefix Optional. What to display before the title.
 * @param bool $display Optional, default is true. Whether to display or retrieve title.
 * @return string|null Title when retrieving, null when displaying or failure.
 */
function post_type_archive_title($prefix = '', $display = true) {
    if (!is_post_type_archive())
        return;

    $post_type_obj = get_queried_object();
    $title = apply_filters('post_type_archive_title', $post_type_obj->labels->name);

    if ($display)
        echo $prefix . $title;
    else
        return $title;
}

/**
 * Display or retrieve page title for category archive.
 *
 * This is useful for category template file or files, because it is optimized
 * for category page title and with less overhead than {@link wp_title()}.
 *
 * It does not support placing the separator after the title, but by leaving the
 * prefix parameter empty, you can set the title separator manually. The prefix
 * does not automatically place a space between the prefix, so if there should
 * be a space, the parameter value will need to have it at the end.
 *
 * @since 0.71
 *
 * @param string $prefix Optional. What to display before the title.
 * @param bool $display Optional, default is true. Whether to display or retrieve title.
 * @return string|null Title when retrieving, null when displaying or failure.
 */
function single_cat_title($prefix = '', $display = true) {
    return single_term_title($prefix, $display);
}

/**
 * Display or retrieve page title for tag post archive.
 *
 * Useful for tag template files for displaying the tag page title. It has less
 * overhead than {@link wp_title()}, because of its limited implementation.
 *
 * It does not support placing the separator after the title, but by leaving the
 * prefix parameter empty, you can set the title separator manually. The prefix
 * does not automatically place a space between the prefix, so if there should
 * be a space, the parameter value will need to have it at the end.
 *
 * @since 2.3.0
 *
 * @param string $prefix Optional. What to display before the title.
 * @param bool $display Optional, default is true. Whether to display or retrieve title.
 * @return string|null Title when retrieving, null when displaying or failure.
 */
function single_tag_title($prefix = '', $display = true) {
    return single_term_title($prefix, $display);
}

/**
 * Display or retrieve page title for taxonomy term archive.
 *
 * Useful for taxonomy term template files for displaying the taxonomy term page title.
 * It has less overhead than {@link wp_title()}, because of its limited implementation.
 *
 * It does not support placing the separator after the title, but by leaving the
 * prefix parameter empty, you can set the title separator manually. The prefix
 * does not automatically place a space between the prefix, so if there should
 * be a space, the parameter value will need to have it at the end.
 *
 * @since 3.1.0
 *
 * @param string $prefix Optional. What to display before the title.
 * @param bool $display Optional, default is true. Whether to display or retrieve title.
 * @return string|null Title when retrieving, null when displaying or failure.
 */
function single_term_title($prefix = '', $display = true) {
    $term = get_queried_object();

    if (!$term)
        return;

    if (is_category ())
        $term_name = apply_filters('single_cat_title', $term->name);
    elseif (is_tag ())
        $term_name = apply_filters('single_tag_title', $term->name);
    elseif (is_tax ())
        $term_name = apply_filters('single_term_title', $term->name);
    else
        return;

    if (empty($term_name))
        return;

    if ($display)
        echo $prefix . $term_name;
    else
        return $term_name;
}

/**
 * Display or retrieve page title for post archive based on date.
 *
 * Useful for when the template only needs to display the month and year, if
 * either are available. Optimized for just this purpose, so if it is all that
 * is needed, should be better than {@link wp_title()}.
 *
 * It does not support placing the separator after the title, but by leaving the
 * prefix parameter empty, you can set the title separator manually. The prefix
 * does not automatically place a space between the prefix, so if there should
 * be a space, the parameter value will need to have it at the end.
 *
 * @since 0.71
 *
 * @param string $prefix Optional. What to display before the title.
 * @param bool $display Optional, default is true. Whether to display or retrieve title.
 * @return string|null Title when retrieving, null when displaying or failure.
 */
function single_month_title($prefix = '', $display = true) {
    global $wp_locale;

    $m = get_query_var('m');
    $year = get_query_var('year');
    $monthnum = get_query_var('monthnum');

    if (!empty($monthnum) && !empty($year)) {
        $my_year = $year;
        $my_month = $wp_locale->get_month($monthnum);
    } elseif (!empty($m)) {
        $my_year = substr($m, 0, 4);
        $my_month = $wp_locale->get_month(substr($m, 4, 2));
    }

    if (empty($my_month))
        return false;

    $result = $prefix . $my_month . $prefix . $my_year;

    if (!$display)
        return $result;
    echo $result;
}

/**
 * Retrieve archive link content based on predefined or custom code.
 *
 * The format can be one of four styles. The 'link' for head element, 'option'
 * for use in the select element, 'html' for use in list (either ol or ul HTML
 * elements). Custom content is also supported using the before and after
 * parameters.
 *
 * The 'link' format uses the link HTML element with the <em>archives</em>
 * relationship. The before and after parameters are not used. The text
 * parameter is used to describe the link.
 *
 * The 'option' format uses the option HTML element for use in select element.
 * The value is the url parameter and the before and after parameters are used
 * between the text description.
 *
 * The 'html' format, which is the default, uses the li HTML element for use in
 * the list HTML elements. The before parameter is before the link and the after
 * parameter is after the closing link.
 *
 * The custom format uses the before parameter before the link ('a' HTML
 * element) and the after parameter after the closing link tag. If the above
 * three values for the format are not used, then custom format is assumed.
 *
 * @since 1.0.0
 *
 * @param string $url URL to archive.
 * @param string $text Archive text description.
 * @param string $format Optional, default is 'html'. Can be 'link', 'option', 'html', or custom.
 * @param string $before Optional.
 * @param string $after Optional.
 * @return string HTML link content for archive.
 */
function get_archives_link($url, $text, $format = 'html', $before = '', $after = '') {
    $text = wptexturize($text);
    $title_text = esc_attr($text);
    $url = esc_url($url);

    if ('link' == $format)
        $link_html = "\t<link rel='archives' title='$title_text' href='$url' />\n";
    elseif ('option' == $format)
        $link_html = "\t<option value='$url'>$before $text $after</option>\n";
    elseif ('html' == $format)
        $link_html = "\t<li>$before<a href='$url' title='$title_text'>$text</a>$after</li>\n";
    else // custom
        $link_html = "\t$before<a href='$url' title='$title_text'>$text</a>$after\n";

    $link_html = apply_filters("get_archives_link", $link_html);

    return $link_html;
}

/**
 * Display archive links based on type and format.
 *
 * The 'type' argument offers a few choices and by default will display monthly
 * archive links. The other options for values are 'daily', 'weekly', 'monthly',
 * 'yearly', 'postbypost' or 'alpha'. Both 'postbypost' and 'alpha' display the
 * same archive link list, the difference between the two is that 'alpha'
 * will order by post title and 'postbypost' will order by post date.
 *
 * The date archives will logically display dates with links to the archive post
 * page. The 'postbypost' and 'alpha' values for 'type' argument will display
 * the post titles.
 *
 * The 'limit' argument will only display a limited amount of links, specified
 * by the 'limit' integer value. By default, there is no limit. The
 * 'show_post_count' argument will show how many posts are within the archive.
 * By default, the 'show_post_count' argument is set to false.
 *
 * For the 'format', 'before', and 'after' arguments, see {@link
 * get_archives_link()}. The values of these arguments have to do with that
 * function.
 *
 * @since 1.2.0
 *
 * @param string|array $args Optional. Override defaults.
 */
function wp_get_archives($args = '') {
    global $wpdb, $wp_locale;

    $defaults = array(
        'type' => 'monthly', 'limit' => '',
        'format' => 'html', 'before' => '',
        'after' => '', 'show_post_count' => false,
        'echo' => 1
    );

    $r = wp_parse_args($args, $defaults);
    extract($r, EXTR_SKIP);

    if ('' == $type)
        $type = 'monthly';

    if ('' != $limit) {
        $limit = absint($limit);
        $limit = ' LIMIT ' . $limit;
    }

    // this is what will separate dates on weekly archive links
    $archive_week_separator = '&#8211;';

    // over-ride general date format ? 0 = no: use the date format set in Options, 1 = yes: over-ride
    $archive_date_format_over_ride = 0;

    // options for daily archive (only if you over-ride the general date format)
    $archive_day_date_format = 'Y/m/d';

    // options for weekly archive (only if you over-ride the general date format)
    $archive_week_start_date_format = 'Y/m/d';
    $archive_week_end_date_format = 'Y/m/d';

    if (!$archive_date_format_over_ride) {
        $archive_day_date_format = get_option('date_format');
        $archive_week_start_date_format = get_option('date_format');
        $archive_week_end_date_format = get_option('date_format');
    }

    //filters
    $where = apply_filters('getarchives_where', "WHERE post_type = 'post' AND post_status = 'publish'", $r);
    $join = apply_filters('getarchives_join', "", $r);

    $output = '';

    if ('monthly' == $type) {
        $query = "SELECT YEAR(post_date) AS `year`, MONTH(post_date) AS `month`, count(ID) as posts FROM $wpdb->posts $join $where GROUP BY YEAR(post_date), MONTH(post_date) ORDER BY post_date DESC $limit";
        $key = md5($query);
        $cache = wp_cache_get('wp_get_archives', 'general');
        if (!isset($cache[$key])) {
            $arcresults = $wpdb->get_results($query);
            $cache[$key] = $arcresults;
            wp_cache_set('wp_get_archives', $cache, 'general');
        } else {
            $arcresults = $cache[$key];
        }
        if ($arcresults) {
            $afterafter = $after;
            foreach ((array) $arcresults as $arcresult) {
                $url = get_month_link($arcresult->year, $arcresult->month);
                /* translators: 1: month name, 2: 4-digit year */
                $text = sprintf(__('%1$s %2$d'), $wp_locale->get_month($arcresult->month), $arcresult->year);
                if ($show_post_count)
                    $after = '&nbsp;(' . $arcresult->posts . ')' . $afterafter;
                $output .= get_archives_link($url, $text, $format, $before, $after);
            }
        }
    } elseif ('yearly' == $type) {
        $query = "SELECT YEAR(post_date) AS `year`, count(ID) as posts FROM $wpdb->posts $join $where GROUP BY YEAR(post_date) ORDER BY post_date DESC $limit";
        $key = md5($query);
        $cache = wp_cache_get('wp_get_archives', 'general');
        if (!isset($cache[$key])) {
            $arcresults = $wpdb->get_results($query);
            $cache[$key] = $arcresults;
            wp_cache_set('wp_get_archives', $cache, 'general');
        } else {
            $arcresults = $cache[$key];
        }
        if ($arcresults) {
            $afterafter = $after;
            foreach ((array) $arcresults as $arcresult) {
                $url = get_year_link($arcresult->year);
                $text = sprintf('%d', $arcresult->year);
                if ($show_post_count)
                    $after = '&nbsp;(' . $arcresult->posts . ')' . $afterafter;
                $output .= get_archives_link($url, $text, $format, $before, $after);
            }
        }
    } elseif ('daily' == $type) {
        $query = "SELECT YEAR(post_date) AS `year`, MONTH(post_date) AS `month`, DAYOFMONTH(post_date) AS `dayofmonth`, count(ID) as posts FROM $wpdb->posts $join $where GROUP BY YEAR(post_date), MONTH(post_date), DAYOFMONTH(post_date) ORDER BY post_date DESC $limit";
        $key = md5($query);
        $cache = wp_cache_get('wp_get_archives', 'general');
        if (!isset($cache[$key])) {
            $arcresults = $wpdb->get_results($query);
            $cache[$key] = $arcresults;
            wp_cache_set('wp_get_archives', $cache, 'general');
        } else {
            $arcresults = $cache[$key];
        }
        if ($arcresults) {
            $afterafter = $after;
            foreach ((array) $arcresults as $arcresult) {
                $url = get_day_link($arcresult->year, $arcresult->month, $arcresult->dayofmonth);
                $date = sprintf('%1$d-%2$02d-%3$02d 00:00:00', $arcresult->year, $arcresult->month, $arcresult->dayofmonth);
                $text = mysql2date($archive_day_date_format, $date);
                if ($show_post_count)
                    $after = '&nbsp;(' . $arcresult->posts . ')' . $afterafter;
                $output .= get_archives_link($url, $text, $format, $before, $after);
            }
        }
    } elseif ('weekly' == $type) {
        $week = _wp_mysql_week('`post_date`');
        $query = "SELECT DISTINCT $week AS `week`, YEAR( `post_date` ) AS `yr`, DATE_FORMAT( `post_date`, '%Y-%m-%d' ) AS `yyyymmdd`, count( `ID` ) AS `posts` FROM `$wpdb->posts` $join $where GROUP BY $week, YEAR( `post_date` ) ORDER BY `post_date` DESC $limit";
        $key = md5($query);
        $cache = wp_cache_get('wp_get_archives', 'general');
        if (!isset($cache[$key])) {
            $arcresults = $wpdb->get_results($query);
            $cache[$key] = $arcresults;
            wp_cache_set('wp_get_archives', $cache, 'general');
        } else {
            $arcresults = $cache[$key];
        }
        $arc_w_last = '';
        $afterafter = $after;
        if ($arcresults) {
            foreach ((array) $arcresults as $arcresult) {
                if ($arcresult->week != $arc_w_last) {
                    $arc_year = $arcresult->yr;
                    $arc_w_last = $arcresult->week;
                    $arc_week = get_weekstartend($arcresult->yyyymmdd, get_option('start_of_week'));
                    $arc_week_start = date_i18n($archive_week_start_date_format, $arc_week['start']);
                    $arc_week_end = date_i18n($archive_week_end_date_format, $arc_week['end']);
                    $url = sprintf('%1$s/%2$s%3$sm%4$s%5$s%6$sw%7$s%8$d', home_url(), '', '?', '=', $arc_year, '&amp;', '=', $arcresult->week);
                    $text = $arc_week_start . $archive_week_separator . $arc_week_end;
                    if ($show_post_count)
                        $after = '&nbsp;(' . $arcresult->posts . ')' . $afterafter;
                    $output .= get_archives_link($url, $text, $format, $before, $after);
                }
            }
        }
    } elseif (( 'postbypost' == $type ) || ('alpha' == $type)) {
        $orderby = ('alpha' == $type) ? "post_title ASC " : "post_date DESC ";
        $query = "SELECT * FROM $wpdb->posts $join $where ORDER BY $orderby $limit";
        $key = md5($query);
        $cache = wp_cache_get('wp_get_archives', 'general');
        if (!isset($cache[$key])) {
            $arcresults = $wpdb->get_results($query);
            $cache[$key] = $arcresults;
            wp_cache_set('wp_get_archives', $cache, 'general');
        } else {
            $arcresults = $cache[$key];
        }
        if ($arcresults) {
            foreach ((array) $arcresults as $arcresult) {
                if ($arcresult->post_date != '0000-00-00 00:00:00') {
                    $url = get_permalink($arcresult);
                    $arc_title = $arcresult->post_title;
                    if ($arc_title)
                        $text = strip_tags(apply_filters('the_title', $arc_title));
                    else
                        $text = $arcresult->ID;
                    $output .= get_archives_link($url, $text, $format, $before, $after);
                }
            }
        }
    }
    if ($echo)
        echo $output;
    else
        return $output;
}

/**
 * Get number of days since the start of the week.
 *
 * @since 1.5.0
 * @usedby get_calendar()
 *
 * @param int $num Number of day.
 * @return int Days since the start of the week.
 */
function calendar_week_mod($num) {
    $base = 7;
    return ($num - $base * floor($num / $base));
}

/**
 * Display calendar with days that have posts as links.
 *
 * The calendar is cached, which will be retrieved, if it exists. If there are
 * no posts for the month, then it will not be displayed.
 *
 * @since 1.0.0
 *
 * @param bool $initial Optional, default is true. Use initial calendar names.
 * @param bool $echo Optional, default is true. Set to false for return.
 */
function get_calendar($initial = true, $echo = true) {
    global $wpdb, $m, $monthnum, $year, $wp_locale, $posts;

    $cache = array();
    $key = md5($m . $monthnum . $year);
    if ($cache = wp_cache_get('get_calendar', 'calendar')) {
        if (is_array($cache) && isset($cache[$key])) {
            if ($echo) {
                echo apply_filters('get_calendar', $cache[$key]);
                return;
            } else {
                return apply_filters('get_calendar', $cache[$key]);
            }
        }
    }

    if (!is_array($cache))
        $cache = array();

    // Quick check. If we have no posts at all, abort!
    if (!$posts) {
        $gotsome = $wpdb->get_var("SELECT 1 as test FROM $wpdb->posts WHERE post_type = 'post' AND post_status = 'publish' LIMIT 1");
        if (!$gotsome) {
            $cache[$key] = '';
            wp_cache_set('get_calendar', $cache, 'calendar');
            return;
        }
    }

    if (isset($_GET['w']))
        $w = '' . intval($_GET['w']);

    // week_begins = 0 stands for Sunday
    $week_begins = intval(get_option('start_of_week'));

    // Let's figure out when we are
    if (!empty($monthnum) && !empty($year)) {
        $thismonth = '' . zeroise(intval($monthnum), 2);
        $thisyear = '' . intval($year);
    } elseif (!empty($w)) {
        // We need to get the month from MySQL
        $thisyear = '' . intval(substr($m, 0, 4));
        $d = (($w - 1) * 7) + 6; //it seems MySQL's weeks disagree with PHP's
        $thismonth = $wpdb->get_var("SELECT DATE_FORMAT((DATE_ADD('{$thisyear}0101', INTERVAL $d DAY) ), '%m')");
    } elseif (!empty($m)) {
        $thisyear = '' . intval(substr($m, 0, 4));
        if (strlen($m) < 6)
            $thismonth = '01';
        else
            $thismonth = '' . zeroise(intval(substr($m, 4, 2)), 2);
    } else {
        $thisyear = gmdate('Y', current_time('timestamp'));
        $thismonth = gmdate('m', current_time('timestamp'));
    }

    $unixmonth = mktime(0, 0, 0, $thismonth, 1, $thisyear);
    $last_day = date('t', $unixmonth);

    // Get the next and previous month and year with at least one post
    $previous = $wpdb->get_row("SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
		FROM $wpdb->posts
		WHERE post_date < '$thisyear-$thismonth-01'
		AND post_type = 'post' AND post_status = 'publish'
			ORDER BY post_date DESC
			LIMIT 1");
    $next = $wpdb->get_row("SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
		FROM $wpdb->posts
		WHERE post_date > '$thisyear-$thismonth-{$last_day} 23:59:59'
		AND post_type = 'post' AND post_status = 'publish'
			ORDER BY post_date ASC
			LIMIT 1");

    /* translators: Calendar caption: 1: month name, 2: 4-digit year */
    $calendar_caption = _x('%1$s %2$s', 'calendar caption');
    $calendar_output = '<table id="wp-calendar" summary="' . esc_attr__('Calendar') . '">
	<caption>' . sprintf($calendar_caption, $wp_locale->get_month($thismonth), date('Y', $unixmonth)) . '</caption>
	<thead>
	<tr>';

    $myweek = array();

    for ($wdcount = 0; $wdcount <= 6; $wdcount++) {
        $myweek[] = $wp_locale->get_weekday(($wdcount + $week_begins) % 7);
    }

    foreach ($myweek as $wd) {
        $day_name = (true == $initial) ? $wp_locale->get_weekday_initial($wd) : $wp_locale->get_weekday_abbrev($wd);
        $wd = esc_attr($wd);
        $calendar_output .= "\n\t\t<th scope=\"col\" title=\"$wd\">$day_name</th>";
    }

    $calendar_output .= '
	</tr>
	</thead>

	<tfoot>
	<tr>';

    if ($previous) {
        $calendar_output .= "\n\t\t" . '<td colspan="3" id="prev"><a href="' . get_month_link($previous->year, $previous->month) . '" title="' . esc_attr(sprintf(__('View posts for %1$s %2$s'), $wp_locale->get_month($previous->month), date('Y', mktime(0, 0, 0, $previous->month, 1, $previous->year)))) . '">&laquo; ' . $wp_locale->get_month_abbrev($wp_locale->get_month($previous->month)) . '</a></td>';
    } else {
        $calendar_output .= "\n\t\t" . '<td colspan="3" id="prev" class="pad">&nbsp;</td>';
    }

    $calendar_output .= "\n\t\t" . '<td class="pad">&nbsp;</td>';

    if ($next) {
        $calendar_output .= "\n\t\t" . '<td colspan="3" id="next"><a href="' . get_month_link($next->year, $next->month) . '" title="' . esc_attr(sprintf(__('View posts for %1$s %2$s'), $wp_locale->get_month($next->month), date('Y', mktime(0, 0, 0, $next->month, 1, $next->year)))) . '">' . $wp_locale->get_month_abbrev($wp_locale->get_month($next->month)) . ' &raquo;</a></td>';
    } else {
        $calendar_output .= "\n\t\t" . '<td colspan="3" id="next" class="pad">&nbsp;</td>';
    }

    $calendar_output .= '
	</tr>
	</tfoot>

	<tbody>
	<tr>';

    // Get days with posts
    $dayswithposts = $wpdb->get_results("SELECT DISTINCT DAYOFMONTH(post_date)
		FROM $wpdb->posts WHERE post_date >= '{$thisyear}-{$thismonth}-01 00:00:00'
		AND post_type = 'post' AND post_status = 'publish'
		AND post_date <= '{$thisyear}-{$thismonth}-{$last_day} 23:59:59'", ARRAY_N);
    if ($dayswithposts) {
        foreach ((array) $dayswithposts as $daywith) {
            $daywithpost[] = $daywith[0];
        }
    } else {
        $daywithpost = array();
    }

    if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false || stripos($_SERVER['HTTP_USER_AGENT'], 'camino') !== false || stripos($_SERVER['HTTP_USER_AGENT'], 'safari') !== false)
        $ak_title_separator = "\n";
    else
        $ak_title_separator = ', ';

    $ak_titles_for_day = array();
    $ak_post_titles = $wpdb->get_results("SELECT ID, post_title, DAYOFMONTH(post_date) as dom "
                    . "FROM $wpdb->posts "
                    . "WHERE post_date >= '{$thisyear}-{$thismonth}-01 00:00:00' "
                    . "AND post_date <= '{$thisyear}-{$thismonth}-{$last_day} 23:59:59' "
                    . "AND post_type = 'post' AND post_status = 'publish'"
    );
    if ($ak_post_titles) {
        foreach ((array) $ak_post_titles as $ak_post_title) {

            $post_title = esc_attr(apply_filters('the_title', $ak_post_title->post_title, $ak_post_title->ID));

            if (empty($ak_titles_for_day['day_' . $ak_post_title->dom]))
                $ak_titles_for_day['day_' . $ak_post_title->dom] = '';
            if (empty($ak_titles_for_day["$ak_post_title->dom"])) // first one
                $ak_titles_for_day["$ak_post_title->dom"] = $post_title;
            else
                $ak_titles_for_day["$ak_post_title->dom"] .= $ak_title_separator . $post_title;
        }
    }


    // See how much we should pad in the beginning
    $pad = calendar_week_mod(date('w', $unixmonth) - $week_begins);
    if (0 != $pad)
        $calendar_output .= "\n\t\t" . '<td colspan="' . esc_attr($pad) . '" class="pad">&nbsp;</td>';

    $daysinmonth = intval(date('t', $unixmonth));
    for ($day = 1; $day <= $daysinmonth; ++$day) {
        if (isset($newrow) && $newrow)
            $calendar_output .= "\n\t</tr>\n\t<tr>\n\t\t";
        $newrow = false;

        if ($day == gmdate('j', current_time('timestamp')) && $thismonth == gmdate('m', current_time('timestamp')) && $thisyear == gmdate('Y', current_time('timestamp')))
            $calendar_output .= '<td id="today">';
        else
            $calendar_output .= '<td>';

        if (in_array($day, $daywithpost)) // any posts today?
            $calendar_output .= '<a href="' . get_day_link($thisyear, $thismonth, $day) . "\" title=\"" . esc_attr($ak_titles_for_day[$day]) . "\">$day</a>";
        else
            $calendar_output .= $day;
        $calendar_output .= '</td>';

        if (6 == calendar_week_mod(date('w', mktime(0, 0, 0, $thismonth, $day, $thisyear)) - $week_begins))
            $newrow = true;
    }

    $pad = 7 - calendar_week_mod(date('w', mktime(0, 0, 0, $thismonth, $day, $thisyear)) - $week_begins);
    if ($pad != 0 && $pad != 7)
        $calendar_output .= "\n\t\t" . '<td class="pad" colspan="' . esc_attr($pad) . '">&nbsp;</td>';

    $calendar_output .= "\n\t</tr>\n\t</tbody>\n\t</table>";

    $cache[$key] = $calendar_output;
    wp_cache_set('get_calendar', $cache, 'calendar');

    if ($echo)
        echo apply_filters('get_calendar', $calendar_output);
    else
        return apply_filters('get_calendar', $calendar_output);
}

/**
 * Purge the cached results of get_calendar.
 *
 * @see get_calendar
 * @since 2.1.0
 */
function delete_get_calendar_cache() {
    wp_cache_delete('get_calendar', 'calendar');
}

add_action('save_post', 'delete_get_calendar_cache');
add_action('delete_post', 'delete_get_calendar_cache');
add_action('update_option_start_of_week', 'delete_get_calendar_cache');
add_action('update_option_gmt_offset', 'delete_get_calendar_cache');

/**
 * Display all of the allowed tags in HTML format with attributes.
 *
 * This is useful for displaying in the comment area, which elements and
 * attributes are supported. As well as any plugins which want to display it.
 *
 * @since 1.0.1
 * @uses $allowedtags
 *
 * @return string HTML allowed tags entity encoded.
 */
function allowed_tags() {
    global $allowedtags;
    $allowed = '';
    foreach ((array) $allowedtags as $tag => $attributes) {
        $allowed .= '<' . $tag;
        if (0 < count($attributes)) {
            foreach ($attributes as $attribute => $limits) {
                $allowed .= ' ' . $attribute . '=""';
            }
        }
        $allowed .= '> ';
    }
    return htmlentities($allowed);
}

/* * *** Date/Time tags **** */

/**
 * Outputs the date in iso8601 format for xml files.
 *
 * @since 1.0.0
 */
function the_date_xml() {
    global $post;
    echo mysql2date('Y-m-d', $post->post_date, false);
}

/**
 * Display or Retrieve the date the current $post was written (once per date)
 *
 * Will only output the date if the current post's date is different from the
 * previous one output.
 *
 * i.e. Only one date listing will show per day worth of posts shown in the loop, even if the
 * function is called several times for each post.
 *
 * HTML output can be filtered with 'the_date'.
 * Date string output can be filtered with 'get_the_date'.
 *
 * @since 0.71
 * @uses get_the_date()
 * @param string $d Optional. PHP date format defaults to the date_format option if not specified.
 * @param string $before Optional. Output before the date.
 * @param string $after Optional. Output after the date.
 * @param bool $echo Optional, default is display. Whether to echo the date or return it.
 * @return string|null Null if displaying, string if retrieving.
 */
function the_date($d = '', $before = '', $after = '', $echo = true) {
    global $currentday, $previousday;
    $the_date = '';
    if ($currentday != $previousday) {
        $the_date .= $before;
        $the_date .= get_the_date($d);
        $the_date .= $after;
        $previousday = $currentday;

        $the_date = apply_filters('the_date', $the_date, $d, $before, $after);

        if ($echo)
            echo $the_date;
        else
            return $the_date;
    }

    return null;
}

/**
 * Retrieve the date the current $post was written.
 *
 * Unlike the_date() this function will always return the date.
 * Modify output with 'get_the_date' filter.
 *
 * @since 3.0.0
 *
 * @param string $d Optional. PHP date format defaults to the date_format option if not specified.
 * @return string|null Null if displaying, string if retrieving.
 */
function get_the_date($d = '') {
    global $post;
    $the_date = '';

    if ('' == $d)
        $the_date .= mysql2date(get_option('date_format'), $post->post_date);
    else
        $the_date .= mysql2date($d, $post->post_date);

    return apply_filters('get_the_date', $the_date, $d);
}

/**
 * Display the date on which the post was last modified.
 *
 * @since 2.1.0
 *
 * @param string $d Optional. PHP date format defaults to the date_format option if not specified.
 * @param string $before Optional. Output before the date.
 * @param string $after Optional. Output after the date.
 * @param bool $echo Optional, default is display. Whether to echo the date or return it.
 * @return string|null Null if displaying, string if retrieving.
 */
function the_modified_date($d = '', $before='', $after='', $echo = true) {

    $the_modified_date = $before . get_the_modified_date($d) . $after;
    $the_modified_date = apply_filters('the_modified_date', $the_modified_date, $d, $before, $after);

    if ($echo)
        echo $the_modified_date;
    else
        return $the_modified_date;
}

/**
 * Retrieve the date on which the post was last modified.
 *
 * @since 2.1.0
 *
 * @param string $d Optional. PHP date format. Defaults to the "date_format" option
 * @return string
 */
function get_the_modified_date($d = '') {
    if ('' == $d)
        $the_time = get_post_modified_time(get_option('date_format'), null, null, true);
    else
        $the_time = get_post_modified_time($d, null, null, true);
    return apply_filters('get_the_modified_date', $the_time, $d);
}

/**
 * Display the time at which the post was written.
 *
 * @since 0.71
 *
 * @param string $d Either 'G', 'U', or php date format.
 */
function the_time($d = '') {
    echo apply_filters('the_time', get_the_time($d), $d);
}

/**
 * Retrieve the time at which the post was written.
 *
 * @since 1.5.0
 *
 * @param string $d Optional Either 'G', 'U', or php date format defaults to the value specified in the time_format option.
 * @param int|object $post Optional post ID or object. Default is global $post object.
 * @return string
 */
function get_the_time($d = '', $post = null) {
    $post = get_post($post);

    if ('' == $d)
        $the_time = get_post_time(get_option('time_format'), false, $post, true);
    else
        $the_time = get_post_time($d, false, $post, true);
    return apply_filters('get_the_time', $the_time, $d, $post);
}

/**
 * Retrieve the time at which the post was written.
 *
 * @since 2.0.0
 *
 * @param string $d Optional Either 'G', 'U', or php date format.
 * @param bool $gmt Optional, default is false. Whether to return the gmt time.
 * @param int|object $post Optional post ID or object. Default is global $post object.
 * @param bool $translate Whether to translate the time string
 * @return string
 */
function get_post_time($d = 'U', $gmt = false, $post = null, $translate = false) { // returns timestamp
    $post = get_post($post);

    if ($gmt)
        $time = $post->post_date_gmt;
    else
        $time = $post->post_date;

    $time = mysql2date($d, $time, $translate);
    return apply_filters('get_post_time', $time, $d, $gmt);
}

/**
 * Display the time at which the post was last modified.
 *
 * @since 2.0.0
 *
 * @param string $d Optional Either 'G', 'U', or php date format defaults to the value specified in the time_format option.
 */
function the_modified_time($d = '') {
    echo apply_filters('the_modified_time', get_the_modified_time($d), $d);
}

/**
 * Retrieve the time at which the post was last modified.
 *
 * @since 2.0.0
 *
 * @param string $d Optional Either 'G', 'U', or php date format defaults to the value specified in the time_format option.
 * @return string
 */
function get_the_modified_time($d = '') {
    if ('' == $d)
        $the_time = get_post_modified_time(get_option('time_format'), null, null, true);
    else
        $the_time = get_post_modified_time($d, null, null, true);
    return apply_filters('get_the_modified_time', $the_time, $d);
}

/**
 * Retrieve the time at which the post was last modified.
 *
 * @since 2.0.0
 *
 * @param string $d Optional, default is 'U'. Either 'G', 'U', or php date format.
 * @param bool $gmt Optional, default is false. Whether to return the gmt time.
 * @param int|object $post Optional, default is global post object. A post_id or post object
 * @param bool $translate Optional, default is false. Whether to translate the result
 * @return string Returns timestamp
 */
function get_post_modified_time($d = 'U', $gmt = false, $post = null, $translate = false) {
    $post = get_post($post);

    if ($gmt)
        $time = $post->post_modified_gmt;
    else
        $time = $post->post_modified;
    $time = mysql2date($d, $time, $translate);

    return apply_filters('get_post_modified_time', $time, $d, $gmt);
}

/**
 * Display the weekday on which the post was written.
 *
 * @since 0.71
 * @uses $wp_locale
 * @uses $post
 */
function the_weekday() {
    global $wp_locale, $post;
    $the_weekday = $wp_locale->get_weekday(mysql2date('w', $post->post_date, false));
    $the_weekday = apply_filters('the_weekday', $the_weekday);
    echo $the_weekday;
}

/**
 * Display the weekday on which the post was written.
 *
 * Will only output the weekday if the current post's weekday is different from
 * the previous one output.
 *
 * @since 0.71
 *
 * @param string $before Optional Output before the date.
 * @param string $after Optional Output after the date.
 */
function the_weekday_date($before='', $after='') {
    global $wp_locale, $post, $day, $previousweekday;
    $the_weekday_date = '';
    if ($currentday != $previousweekday) {
        $the_weekday_date .= $before;
        $the_weekday_date .= $wp_locale->get_weekday(mysql2date('w', $post->post_date, false));
        $the_weekday_date .= $after;
        $previousweekday = $currentday;
    }
    $the_weekday_date = apply_filters('the_weekday_date', $the_weekday_date, $before, $after);
    echo $the_weekday_date;
}

/**
 * Fire the wp_head action
 *
 * @since 1.2.0
 * @uses do_action() Calls 'wp_head' hook.
 */
function wp_head() {
    do_action('wp_head');
}

/**
 * Fire the wp_footer action
 *
 * @since 1.5.1
 * @uses do_action() Calls 'wp_footer' hook.
 */
function wp_footer() {
    do_action('wp_footer');
}

/**
 * Display the links to the general feeds.
 *
 * @since 2.8.0
 *
 * @param array $args Optional arguments.
 */
function feed_links($args = array()) {
    if (!current_theme_supports('automatic-feed-links'))
        return;

    $defaults = array(
        /* translators: Separator between blog name and feed type in feed links */
        'separator' => _x('&raquo;', 'feed link'),
        /* translators: 1: blog title, 2: separator (raquo) */
        'feedtitle' => __('%1$s %2$s Feed'),
        /* translators: %s: blog title, 2: separator (raquo) */
        'comstitle' => __('%1$s %2$s Comments Feed'),
    );

    $args = wp_parse_args($args, $defaults);

    echo '<link rel="alternate" type="' . feed_content_type() . '" title="' . esc_attr(sprintf($args['feedtitle'], get_bloginfo('name'), $args['separator'])) . '" href="' . get_feed_link() . "\" />\n";
    echo '<link rel="alternate" type="' . feed_content_type() . '" title="' . esc_attr(sprintf($args['comstitle'], get_bloginfo('name'), $args['separator'])) . '" href="' . get_feed_link('comments_' . get_default_feed()) . "\" />\n";
}

/**
 * Display the links to the extra feeds such as category feeds.
 *
 * @since 2.8.0
 *
 * @param array $args Optional arguments.
 */
function feed_links_extra($args = array()) {
    $defaults = array(
        /* translators: Separator between blog name and feed type in feed links */
        'separator' => _x('&raquo;', 'feed link'),
        /* translators: 1: blog name, 2: separator(raquo), 3: post title */
        'singletitle' => __('%1$s %2$s %3$s Comments Feed'),
        /* translators: 1: blog name, 2: separator(raquo), 3: category name */
        'cattitle' => __('%1$s %2$s %3$s Category Feed'),
        /* translators: 1: blog name, 2: separator(raquo), 3: tag name */
        'tagtitle' => __('%1$s %2$s %3$s Tag Feed'),
        /* translators: 1: blog name, 2: separator(raquo), 3: author name  */
        'authortitle' => __('%1$s %2$s Posts by %3$s Feed'),
        /* translators: 1: blog name, 2: separator(raquo), 3: search phrase */
        'searchtitle' => __('%1$s %2$s Search Results for &#8220;%3$s&#8221; Feed'),
    );

    $args = wp_parse_args($args, $defaults);

    if (is_single() || is_page()) {
        $post = &get_post($id = 0);

        if (comments_open() || pings_open() || $post->comment_count > 0) {
            $title = esc_attr(sprintf($args['singletitle'], get_bloginfo('name'), $args['separator'], esc_html(get_the_title())));
            $href = get_post_comments_feed_link($post->ID);
        }
    } elseif (is_category ()) {
        $term = get_queried_object();

        $title = esc_attr(sprintf($args['cattitle'], get_bloginfo('name'), $args['separator'], $term->name));
        $href = get_category_feed_link($term->term_id);
    } elseif (is_tag ()) {
        $term = get_queried_object();

        $title = esc_attr(sprintf($args['tagtitle'], get_bloginfo('name'), $args['separator'], $term->name));
        $href = get_tag_feed_link($term->term_id);
    } elseif (is_author ()) {
        $author_id = intval(get_query_var('author'));

        $title = esc_attr(sprintf($args['authortitle'], get_bloginfo('name'), $args['separator'], get_the_author_meta('display_name', $author_id)));
        $href = get_author_feed_link($author_id);
    } elseif (is_search ()) {
        $title = esc_attr(sprintf($args['searchtitle'], get_bloginfo('name'), $args['separator'], get_search_query(false)));
        $href = get_search_feed_link();
    }

    if (isset($title) && isset($href))
        echo '<link rel="alternate" type="' . feed_content_type() . '" title="' . $title . '" href="' . $href . '" />' . "\n";
}

/**
 * Display the link to the Really Simple Discovery service endpoint.
 *
 * @link http://archipelago.phrasewise.com/rsd
 * @since 2.0.0
 */
function rsd_link() {
    echo '<link rel="EditURI" type="application/rsd+xml" title="RSD" href="' . get_bloginfo('wpurl') . "/xmlrpc.php?rsd\" />\n";
}

/**
 * Display the link to the Windows Live Writer manifest file.
 *
 * @link http://msdn.microsoft.com/en-us/library/bb463265.aspx
 * @since 2.3.1
 */
function wlwmanifest_link() {
    echo '<link rel="wlwmanifest" type="application/wlwmanifest+xml" href="'
    . get_bloginfo('wpurl') . '/wp-includes/wlwmanifest.xml" /> ' . "\n";
}

/**
 * Display a noindex meta tag if required by the blog configuration.
 *
 * If a blog is marked as not being public then the noindex meta tag will be
 * output to tell web robots not to index the page content.
 *
 * @since 2.1.0
 */
function noindex() {
    // If the blog is not public, tell robots to go away.
    if ('0' == get_option('blog_public'))
        echo "<meta name='robots' content='noindex,nofollow' />\n";
}

/**
 * Determine if TinyMCE is available.
 *
 * Checks to see if the user has deleted the tinymce files to slim down there WordPress install.
 *
 * @since 2.1.0
 *
 * @return bool Whether TinyMCE exists.
 */
function rich_edit_exists() {
    global $wp_rich_edit_exists;
    if (!isset($wp_rich_edit_exists))
        $wp_rich_edit_exists = file_exists(ABSPATH . WPINC . '/js/tinymce/tiny_mce.js');
    return $wp_rich_edit_exists;
}

/**
 * Whether the user should have a WYSIWIG editor.
 *
 * Checks that the user requires a WYSIWIG editor and that the editor is
 * supported in the users browser.
 *
 * @since 2.0.0
 *
 * @return bool
 */
function user_can_richedit() {
    global $wp_rich_edit, $pagenow, $is_iphone;

    if (!isset($wp_rich_edit)) {
        if (get_user_option('rich_editing') == 'true' &&
                !$is_iphone && // this includes all Safari mobile browsers
                ( ( preg_match('!AppleWebKit/(\d+)!', $_SERVER['HTTP_USER_AGENT'], $match) && intval($match[1]) >= 420 ) ||
                !preg_match('!opera[ /][2-8]|konqueror|safari!i', $_SERVER['HTTP_USER_AGENT']) )
                && 'comment.php' != $pagenow) {
            $wp_rich_edit = true;
        } else {
            $wp_rich_edit = false;
        }
    }

    return apply_filters('user_can_richedit', $wp_rich_edit);
}

/**
 * Find out which editor should be displayed by default.
 *
 * Works out which of the two editors to display as the current editor for a
 * user.
 *
 * @since 2.5.0
 *
 * @return string Either 'tinymce', or 'html', or 'test'
 */
function wp_default_editor() {
    $r = user_can_richedit() ? 'tinymce' : 'html'; // defaults
    if ($user = wp_get_current_user()) { // look for cookie
        $ed = get_user_setting('editor', 'tinymce');
        $r = ( in_array($ed, array('tinymce', 'html', 'test')) ) ? $ed : $r;
    }
    return apply_filters('wp_default_editor', $r); // filter
}

/**
 * Display visual editor forms: TinyMCE, or HTML, or both.
 *
 * The amount of rows the text area will have for the content has to be between
 * 3 and 100 or will default at 12. There is only one option used for all users,
 * named 'default_post_edit_rows'.
 *
 * If the user can not use the rich editor (TinyMCE), then the switch button
 * will not be displayed.
 *
 * @since 2.1.0
 *
 * @param string $content Textarea content.
 * @param string $id Optional, default is 'content'. HTML ID attribute value.
 * @param string $prev_id Optional, default is 'title'. HTML ID name for switching back and forth between visual editors.
 * @param bool $media_buttons Optional, default is true. Whether to display media buttons.
 * @param int $tab_index Optional, default is 2. Tabindex for textarea element.
 */
function the_editor($content, $id = 'content', $prev_id = 'title', $media_buttons = true, $tab_index = 2) {
    $rows = get_option('default_post_edit_rows');
    if (($rows < 3) || ($rows > 100))
        $rows = 12;

    if (!current_user_can('upload_files'))
        $media_buttons = false;

    $richedit = user_can_richedit();
    $class = '';

    if ($richedit || $media_buttons) {
?>
        <div id="editor-toolbar">
    <?php
        if ($richedit) {
            $wp_default_editor = wp_default_editor();
    ?>
            <div class="zerosize"><input accesskey="e" type="button" onclick="switchEditors.go('<?php echo $id; ?>')" /></div>
    <?php if ('html' == $wp_default_editor) {
                add_filter('the_editor_content', 'wp_htmledit_pre'); ?>
                <a id="edButtonHTML" class="active hide-if-no-js" onclick="switchEditors.go('<?php echo $id; ?>', 'html');"><?php _e('HTML'); ?></a>
                <a id="edButtonPreview" class="hide-if-no-js" onclick="switchEditors.go('<?php echo $id; ?>', 'tinymce');"><?php _e('Visual'); ?></a>
    <?php
            } else {
                $class = " class='theEditor'";
                add_filter('the_editor_content', 'wp_richedit_pre'); ?>
                <a id="edButtonHTML" class="hide-if-no-js" onclick="switchEditors.go('<?php echo $id; ?>', 'html');"><?php _e('HTML'); ?></a>
                <a id="edButtonPreview" class="active hide-if-no-js" onclick="switchEditors.go('<?php echo $id; ?>', 'tinymce');"><?php _e('Visual'); ?></a>
    <?php
            }
        }

        if ($media_buttons) {
    ?>
            <div id="media-buttons" class="hide-if-no-js">
        <?php do_action('media_buttons'); ?>
        </div>
    <?php } ?>
    </div>
<?php
    }
?>
    <div id="quicktags"><?php wp_print_scripts('quicktags'); ?>
        <script type="text/javascript">edToolbar()</script>
    </div>

<?php
    $the_editor = apply_filters('the_editor', "<div id='editorcontainer'><textarea rows='$rows'$class cols='40' name='$id' tabindex='$tab_index' id='$id'>%s</textarea></div>\n");
    $the_editor_content = apply_filters('the_editor_content', $content);

    printf($the_editor, $the_editor_content);
?>
    <script type="text/javascript">
        edCanvas = document.getElementById('<?php echo $id; ?>');
    </script>
<?php
}

/**
 * Retrieve the contents of the search WordPress query variable.
 *
 * The search query string is passed through {@link esc_attr()}
 * to ensure that it is safe for placing in an html attribute.
 *
 * @since 2.3.0
 * @uses esc_attr()
 *
 * @param bool $escaped Whether the result is escaped. Default true.
 * 	Only use when you are later escaping it. Do not use unescaped.
 * @return string
 */
function get_search_query($escaped = true) {
    $query = apply_filters('get_search_query', get_query_var('s'));
    if ($escaped)
        $query = esc_attr($query);
    return $query;
}

/**
 * Display the contents of the search query variable.
 *
 * The search query string is passed through {@link esc_attr()}
 * to ensure that it is safe for placing in an html attribute.
 *
 * @uses esc_attr()
 * @since 2.1.0
 */
function the_search_query() {
    echo esc_attr(apply_filters('the_search_query', get_search_query(false)));
}

/**
 * Display the language attributes for the html tag.
 *
 * Builds up a set of html attributes containing the text direction and language
 * information for the page.
 *
 * @since 2.1.0
 *
 * @param string $doctype The type of html document (xhtml|html).
 */
function language_attributes($doctype = 'html') {
    $attributes = array();
    $output = '';

    if (function_exists('is_rtl'))
        $attributes[] = 'dir="' . ( is_rtl() ? 'rtl' : 'ltr' ) . '"';

    if ($lang = get_bloginfo('language')) {
        if (get_option('html_type') == 'text/html' || $doctype == 'html')
            $attributes[] = "lang=\"$lang\"";

        if (get_option('html_type') != 'text/html' || $doctype == 'xhtml')
            $attributes[] = "xml:lang=\"$lang\"";
    }

    $output = implode(' ', $attributes);
    $output = apply_filters('language_attributes', $output);
    echo $output;
}

/**
 * Retrieve paginated link for archive post pages.
 *
 * Technically, the function can be used to create paginated link list for any
 * area. The 'base' argument is used to reference the url, which will be used to
 * create the paginated links. The 'format' argument is then used for replacing
 * the page number. It is however, most likely and by default, to be used on the
 * archive post pages.
 *
 * The 'type' argument controls format of the returned value. The default is
 * 'plain', which is just a string with the links separated by a newline
 * character. The other possible values are either 'array' or 'list'. The
 * 'array' value will return an array of the paginated link list to offer full
 * control of display. The 'list' value will place all of the paginated links in
 * an unordered HTML list.
 *
 * The 'total' argument is the total amount of pages and is an integer. The
 * 'current' argument is the current page number and is also an integer.
 *
 * An example of the 'base' argument is "http://example.com/all_posts.php%_%"
 * and the '%_%' is required. The '%_%' will be replaced by the contents of in
 * the 'format' argument. An example for the 'format' argument is "?page=%#%"
 * and the '%#%' is also required. The '%#%' will be replaced with the page
 * number.
 *
 * You can include the previous and next links in the list by setting the
 * 'prev_next' argument to true, which it is by default. You can set the
 * previous text, by using the 'prev_text' argument. You can set the next text
 * by setting the 'next_text' argument.
 *
 * If the 'show_all' argument is set to true, then it will show all of the pages
 * instead of a short list of the pages near the current page. By default, the
 * 'show_all' is set to false and controlled by the 'end_size' and 'mid_size'
 * arguments. The 'end_size' argument is how many numbers on either the start
 * and the end list edges, by default is 1. The 'mid_size' argument is how many
 * numbers to either side of current page, but not including current page.
 *
 * It is possible to add query vars to the link by using the 'add_args' argument
 * and see {@link add_query_arg()} for more information.
 *
 * @since 2.1.0
 *
 * @param string|array $args Optional. Override defaults.
 * @return array|string String of page links or array of page links.
 */
function paginate_links($args = '') {
    $defaults = array(
        'base' => '%_%', // http://example.com/all_posts.php%_% : %_% is replaced by format (below)
        'format' => '?page=%#%', // ?page=%#% : %#% is replaced by the page number
        'total' => 1,
        'current' => 0,
        'show_all' => false,
        'prev_next' => true,
        'prev_text' => __('&laquo; Previous'),
        'next_text' => __('Next &raquo;'),
        'end_size' => 1,
        'mid_size' => 2,
        'type' => 'plain',
        'add_args' => false, // array of query args to add
        'add_fragment' => ''
    );

    $args = wp_parse_args($args, $defaults);
    extract($args, EXTR_SKIP);

    // Who knows what else people pass in $args
    $total = (int) $total;
    if ($total < 2)
        return;
    $current = (int) $current;
    $end_size = 0 < (int) $end_size ? (int) $end_size : 1; // Out of bounds?  Make it the default.
    $mid_size = 0 <= (int) $mid_size ? (int) $mid_size : 2;
    $add_args = is_array($add_args) ? $add_args : false;
    $r = '';
    $page_links = array();
    $n = 0;
    $dots = false;

    if ($prev_next && $current && 1 < $current) :
        $link = str_replace('%_%', 2 == $current ? '' : $format, $base);
        $link = str_replace('%#%', $current - 1, $link);
        if ($add_args)
            $link = add_query_arg($add_args, $link);
        $link .= $add_fragment;
        $page_links[] = "<a class='prev page-numbers' href='" . esc_url(apply_filters('paginate_links', $link)) . "'>$prev_text</a>";
    endif;
    for ($n = 1; $n <= $total; $n++) :
        $n_display = number_format_i18n($n);
        if ($n == $current) :
            $page_links[] = "<span class='page-numbers current'>$n_display</span>";
            $dots = true;
        else :
            if ($show_all || ( $n <= $end_size || ( $current && $n >= $current - $mid_size && $n <= $current + $mid_size ) || $n > $total - $end_size )) :
                $link = str_replace('%_%', 1 == $n ? '' : $format, $base);
                $link = str_replace('%#%', $n, $link);
                if ($add_args)
                    $link = add_query_arg($add_args, $link);
                $link .= $add_fragment;
                $page_links[] = "<a class='page-numbers' href='" . esc_url(apply_filters('paginate_links', $link)) . "'>$n_display</a>";
                $dots = true;
            elseif ($dots && !$show_all) :
                $page_links[] = "<span class='page-numbers dots'>...</span>";
                $dots = false;
            endif;
        endif;
    endfor;
    if ($prev_next && $current && ( $current < $total || -1 == $total )) :
        $link = str_replace('%_%', $format, $base);
        $link = str_replace('%#%', $current + 1, $link);
        if ($add_args)
            $link = add_query_arg($add_args, $link);
        $link .= $add_fragment;
        $page_links[] = "<a class='next page-numbers' href='" . esc_url(apply_filters('paginate_links', $link)) . "'>$next_text</a>";
    endif;
    switch ($type) :
        case 'array' :
            return $page_links;
            break;
        case 'list' :
            $r .= "<ul class='page-numbers'>\n\t<li>";
            $r .= join("</li>\n\t<li>", $page_links);
            $r .= "</li>\n</ul>\n";
            break;
        default :
            $r = join("\n", $page_links);
            break;
    endswitch;
    return $r;
}

/**
 * Registers an admin colour scheme css file.
 *
 * Allows a plugin to register a new admin colour scheme. For example:
 * <code>
 * wp_admin_css_color('classic', __('Classic'), admin_url("css/colors-classic.css"),
 * array('#07273E', '#14568A', '#D54E21', '#2683AE'));
 * </code>
 *
 * @since 2.5.0
 *
 * @param string $key The unique key for this theme.
 * @param string $name The name of the theme.
 * @param string $url The url of the css file containing the colour scheme.
 * @param array $colors Optional An array of CSS color definitions which are used to give the user a feel for the theme.
 */
function wp_admin_css_color($key, $name, $url, $colors = array()) {
    global $_wp_admin_css_colors;

    if (!isset($_wp_admin_css_colors))
        $_wp_admin_css_colors = array();

    $_wp_admin_css_colors[$key] = (object) array('name' => $name, 'url' => $url, 'colors' => $colors);
}

/**
 * Registers the default Admin color schemes
 *
 * @since 3.0.0
 */
function register_admin_color_schemes() {
    wp_admin_css_color('classic', __('Blue'), admin_url('css/colors-classic.css'),
            array('#5589aa', '#cfdfe9', '#d1e5ee', '#eff8ff'));
    wp_admin_css_color('fresh', __('Gray'), admin_url('css/colors-fresh.css'),
            array('#7c7976', '#c6c6c6', '#e0e0e0', '#f1f1f1'));
}

/**
 * Display the URL of a WordPress admin CSS file.
 *
 * @see WP_Styles::_css_href and its style_loader_src filter.
 *
 * @since 2.3.0
 *
 * @param string $file file relative to wp-admin/ without its ".css" extension.
 */
function wp_admin_css_uri($file = 'wp-admin') {
    if (defined('WP_INSTALLING')) {
        $_file = "./$file.css";
    } else {
        $_file = admin_url("$file.css");
    }
    $_file = add_query_arg('version', get_bloginfo('version'), $_file);

    return apply_filters('wp_admin_css_uri', $_file, $file);
}

/**
 * Enqueues or directly prints a stylesheet link to the specified CSS file.
 *
 * "Intelligently" decides to enqueue or to print the CSS file. If the
 * 'wp_print_styles' action has *not* yet been called, the CSS file will be
 * enqueued. If the wp_print_styles action *has* been called, the CSS link will
 * be printed. Printing may be forced by passing TRUE as the $force_echo
 * (second) parameter.
 *
 * For backward compatibility with WordPress 2.3 calling method: If the $file
 * (first) parameter does not correspond to a registered CSS file, we assume
 * $file is a file relative to wp-admin/ without its ".css" extension. A
 * stylesheet link to that generated URL is printed.
 *
 * @package WordPress
 * @since 2.3.0
 * @uses $wp_styles WordPress Styles Object
 *
 * @param string $file Optional. Style handle name or file name (without ".css" extension) relative
 * 	 to wp-admin/. Defaults to 'wp-admin'.
 * @param bool $force_echo Optional.  Force the stylesheet link to be printed rather than enqueued.
 */
function wp_admin_css($file = 'wp-admin', $force_echo = false) {
    global $wp_styles;
    if (!is_a($wp_styles, 'WP_Styles'))
        $wp_styles = new WP_Styles();

    // For backward compatibility
    $handle = 0 === strpos($file, 'css/') ? substr($file, 4) : $file;

    if ($wp_styles->query($handle)) {
        if ($force_echo || did_action('wp_print_styles')) // we already printed the style queue.  Print this one immediately
            wp_print_styles($handle);
        else // Add to style queue
            wp_enqueue_style($handle);
        return;
    }

    echo apply_filters('wp_admin_css', "<link rel='stylesheet' href='" . esc_url(wp_admin_css_uri($file)) . "' type='text/css' />\n", $file);
    if (is_rtl ())
        echo apply_filters('wp_admin_css', "<link rel='stylesheet' href='" . esc_url(wp_admin_css_uri("$file-rtl")) . "' type='text/css' />\n", "$file-rtl");
}

/**
 * Enqueues the default ThickBox js and css.
 *
 * If any of the settings need to be changed, this can be done with another js
 * file similar to media-upload.js and theme-preview.js. That file should
 * require array('thickbox') to ensure it is loaded after.
 *
 * @since 2.5.0
 */
function add_thickbox() {
    wp_enqueue_script('thickbox');
    wp_enqueue_style('thickbox');

    if (is_network_admin ())
        add_action('admin_head', '_thickbox_path_admin_subfolder');
}

/**
 * Display the XHTML generator that is generated on the wp_head hook.
 *
 * @since 2.5.0
 */
function wp_generator() {
    the_generator(apply_filters('wp_generator_type', 'xhtml'));
}

/**
 * Display the generator XML or Comment for RSS, ATOM, etc.
 *
 * Returns the correct generator type for the requested output format. Allows
 * for a plugin to filter generators overall the the_generator filter.
 *
 * @since 2.5.0
 * @uses apply_filters() Calls 'the_generator' hook.
 *
 * @param string $type The type of generator to output - (html|xhtml|atom|rss2|rdf|comment|export).
 */
function the_generator($type) {
    echo apply_filters('the_generator', get_the_generator($type), $type) . "\n";
}

/**
 * Creates the generator XML or Comment for RSS, ATOM, etc.
 *
 * Returns the correct generator type for the requested output format. Allows
 * for a plugin to filter generators on an individual basis using the
 * 'get_the_generator_{$type}' filter.
 *
 * @since 2.5.0
 * @uses apply_filters() Calls 'get_the_generator_$type' hook.
 *
 * @param string $type The type of generator to return - (html|xhtml|atom|rss2|rdf|comment|export).
 * @return string The HTML content for the generator.
 */
function get_the_generator($type = '') {
    if (empty($type)) {

        $current_filter = current_filter();
        if (empty($current_filter))
            return;

        switch ($current_filter) {
            case 'rss2_head' :
            case 'commentsrss2_head' :
                $type = 'rss2';
                break;
            case 'rss_head' :
            case 'opml_head' :
                $type = 'comment';
                break;
            case 'rdf_header' :
                $type = 'rdf';
                break;
            case 'atom_head' :
            case 'comments_atom_head' :
            case 'app_head' :
                $type = 'atom';
                break;
        }
    }

    switch ($type) {
        case 'html':
            $gen = '<meta name="generator" content="WordPress ' . get_bloginfo('version') . '">';
            break;
        case 'xhtml':
            $gen = '<meta name="generator" content="WordPress ' . get_bloginfo('version') . '" />';
            break;
        case 'atom':
            $gen = '<generator uri="http://wordpress.org/" version="' . get_bloginfo_rss('version') . '">WordPress</generator>';
            break;
        case 'rss2':
            $gen = '<generator>http://wordpress.org/?v=' . get_bloginfo_rss('version') . '</generator>';
            break;
        case 'rdf':
            $gen = '<admin:generatorAgent rdf:resource="http://wordpress.org/?v=' . get_bloginfo_rss('version') . '" />';
            break;
        case 'comment':
            $gen = '<!-- generator="WordPress/' . get_bloginfo('version') . '" -->';
            break;
        case 'export':
            $gen = '<!-- generator="WordPress/' . get_bloginfo_rss('version') . '" created="' . date('Y-m-d H:i') . '" -->';
            break;
    }
    return apply_filters("get_the_generator_{$type}", $gen, $type);
}

/**
 * Outputs the html checked attribute.
 *
 * Compares the first two arguments and if identical marks as checked
 *
 * @since 1.0.0
 *
 * @param mixed $checked One of the values to compare
 * @param mixed $current (true) The other value to compare if not just true
 * @param bool $echo Whether to echo or just return the string
 * @return string html attribute or empty string
 */
function checked($checked, $current = true, $echo = true) {
    return __checked_selected_helper($checked, $current, $echo, 'checked');
}

/**
 * Outputs the html selected attribute.
 *
 * Compares the first two arguments and if identical marks as selected
 *
 * @since 1.0.0
 *
 * @param mixed $selected One of the values to compare
 * @param mixed $current (true) The other value to compare if not just true
 * @param bool $echo Whether to echo or just return the string
 * @return string html attribute or empty string
 */
function selected($selected, $current = true, $echo = true) {
    return __checked_selected_helper($selected, $current, $echo, 'selected');
}

/**
 * Outputs the html disabled attribute.
 *
 * Compares the first two arguments and if identical marks as disabled
 *
 * @since 3.0.0
 *
 * @param mixed $disabled One of the values to compare
 * @param mixed $current (true) The other value to compare if not just true
 * @param bool $echo Whether to echo or just return the string
 * @return string html attribute or empty string
 */
function disabled($disabled, $current = true, $echo = true) {
    return __checked_selected_helper($disabled, $current, $echo, 'disabled');
}

/**
 * Private helper function for checked, selected, and disabled.
 *
 * Compares the first two arguments and if identical marks as $type
 *
 * @since 2.8.0
 * @access private
 *
 * @param any $helper One of the values to compare
 * @param any $current (true) The other value to compare if not just true
 * @param bool $echo Whether to echo or just return the string
 * @param string $type The type of checked|selected|disabled we are doing
 * @return string html attribute or empty string
 */
function __checked_selected_helper($helper, $current, $echo, $type) {
    if ((string) $helper === (string) $current)
        $result = " $type='$type'";
    else
        $result = '';

    if ($echo)
        echo $result;

    return $result;
}
?>
